Chronic diarrhea is characterized by a significant increase in the number of bowel movements and thin stools, and has a long duration and recurrent symptoms. The most significant difference between chronic diarrhea and acute diarrhea is the difference in the duration of the disease, which can last more than 6 weeks, and the symptoms of diarrhea can recur. First of all, the number of bowel movements may increase, up to 3 or even dozens of times a day. If the disease is not controlled in time, it can develop into watery discharge, which can affect the digestive function, and undigested food can be found in the stool, and in severe cases, pus and blood or mucus can be seen in the stool. It can be accompanied by systemic symptoms, such as fever, nausea and vomiting, abdominal pain and distension, hyperactive bowel sounds, etc. When defecating for a long time, there can be a burning sensation in the anus and urgency. Chronic diarrhea is mostly associated with some chronic diseases and should be examined in time to prevent delays. Chronic diarrhea is a common clinical symptom with a complex etiology and a prolonged course. Depending on the cause, clinical symptoms can be diverse, and careful clinical diagnosis is needed in combination with medical history and detailed examination. The symptoms should be treated promptly to avoid deterioration of the disease.